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mmc: dw_mmc: fix pio mode when internal dmac is enabled 

The dw_mci_init_dma() may decide to not use dma, but pio instead, caused
by things like wrong dma settings in the system.

Till now the code dw_mci_init_slot() always assumed that dma is available
when CONFIG_MMC_DW_IDMAC was defined, ignoring the host->use_dma var
set during dma init.

So when now the dma init failed for whatever reason, the transfer sizes
would still be set for dma transfers, especially including the maximum
block-count calculated from host->ring_size and resulting in a

[    4.991109] ------------[ cut here ]------------
[    4.991111] kernel BUG at drivers/mmc/core/core.c:256!
[    4.991113] Internal error: Oops - BUG: 0 [#1] SMP ARM

because host->ring_size is 0 in this case and the slot init code uses
the wrong code to calculate the values.

Fix this by selecting the correct calculations using the host->use_dma
variable instead of the CONFIG_MMC_DW_IDMAC config option.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Heiko Stuebner 2015-08-03 17:04:10 +02:00 committed by Ulf Hansson
parent 0e3a22c044
commit 575c319dfe
2 changed files with 14 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/mmc/host/dw_mmc.c
View File

@ -2444,19 +2444,20 @@ static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
mmc->max_seg_size = host->pdata->blk_settings->max_seg_size;
} else {
/* Useful defaults if platform data is unset. */
#ifdef CONFIG_MMC_DW_IDMAC
mmc->max_segs = host->ring_size;
mmc->max_blk_size = 65536;
mmc->max_seg_size = DW_MCI_DESC_DATA_LENGTH;
mmc->max_req_size = mmc->max_seg_size * host->ring_size;
mmc->max_blk_count = mmc->max_req_size / 512;
#else
mmc->max_segs = 64;
mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
mmc->max_blk_count = 512;
mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
mmc->max_seg_size = mmc->max_req_size;
#endif /* CONFIG_MMC_DW_IDMAC */
if (host->use_dma) {
mmc->max_segs = host->ring_size;
mmc->max_blk_size = 65536;
mmc->max_seg_size = 0x1000;
mmc->max_req_size = mmc->max_seg_size * host->ring_size;
mmc->max_blk_count = mmc->max_req_size / 512;
} else {
mmc->max_segs = 64;
mmc->max_blk_size = 65536; /* BLKSIZ is 16 bits */
mmc->max_blk_count = 512;
mmc->max_req_size = mmc->max_blk_size *
mmc->max_blk_count;
mmc->max_seg_size = mmc->max_req_size;
}
}
if (dw_mci_get_cd(mmc))

4
include/linux/mmc/dw_mmc.h
View File

@ -153,11 +153,7 @@ struct dw_mci {
dma_addr_t sg_dma;
void *sg_cpu;
const struct dw_mci_dma_ops *dma_ops;
#ifdef CONFIG_MMC_DW_IDMAC
unsigned int ring_size;
#else
struct dw_mci_dma_data *dma_data;
#endif
u32 cmd_status;
u32 data_status;
u32 stop_cmdr;